(19)

(11)

EP 2 089 674 A2

(12)

(88) Date of publication A3: 06.11.2008 (43) Date of publication: 19.08.2009 Bulletin 2009/34 (21) Application number: 06844693.9 (22) Date of filing: 29.12.2006

(51) International Patent Classification (IPC):  G01C 9/00(2006.01) (86) International application number: PCT/US2006/045941 (87) International publication number: WO 2008/085146 (17.07.2008 Gazette 2008/29)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (71) Applicant: Agere Systems, Inc. Allentown, PA 18109 (US)	(72) Inventors: REINHOLD, Stanley Allentown, PA 18104 (US) WANG, Xiao-An Allentown, PA 18104 (US) (74) Representative: Williams, David John  Page White & Farrer Bedford House John Street London WC1N 2BF London WC1N 2BF (GB)